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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b68865e3fd01edaf5ba34b60e3534e7109c5f697a6a8bb20602d16a47f79c44' 
  AND token = 'IM+BPAFnmdFNdLhMXZ0ZqeIcsRq8IBvHdJuF74LO14s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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