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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51c2eadf66525e01b6425f671a905b009085ff2bca2774c1b546e78985b529e' 
  AND token = '6xRaytA47sNa7Mob/IvgFS5VdoSSv7Dt2rHPRh9WGiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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