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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94da74dd1db1dd22c486a6ce495a9bb5d5d6b35ee75c2c62bc9625f5fee16949' 
  AND token = 'Kr++Z1d1Qy7Dq3WOe2G1LzeoR2sebYKO5Pn9O9IXrLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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