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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cdfbcd2e9071ea13fbeda1557f0915fbea0246714261813dfd6aad7b705f3b' 
  AND token = 'axrbCEOP7cuty6NqiPNKee2xSMJIF/C2R/l0cnAgqgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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