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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4140b41793b22c9b3d2dff90afe61ee76f6742968e14078553767cefe2732bb' 
  AND token = 'wUJCp5M2vp7k9mJMKELC2rZQw3OMXTkJMk4evcYeu9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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