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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77bcbb062db7417576173914a429e17b8631c1610f7e0e02cb56fcce9e5c30b' 
  AND token = 'T0Z/LSpICz8U4OXCkaC0VUyem8VUVSsz201qH2fshiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}