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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7c0ed1e0a7335a39cc196b3d68b477c5d096f332f767b1173f9b60ab0adcf1' 
  AND token = 'IzLHEiPnidWW0uytgq4GdLriJCZnz1KLKSgbatvxLUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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