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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea95a4d6ff6931e7be56d6b856b20500042fb56bc6cb0407f5093aaf9ae2e017' 
  AND token = '+N5gm5HMfbJwcGFCcynhEMiPPfvBx8PZAq5esFX7A8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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