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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bbdb5a4ee6e8979812ecb77133e03f736ee5517ace301a3151b11dbd29307a' 
  AND token = 'QgiwRLxy0gDMRXXNcFK+6D+Md1uidsuW8YaO5p5eT+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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