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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d6c612baaeadaa469e99b8ec2a95dcf01570fa8ab2e4b4aca817948846dc84' 
  AND token = 'gbrJzlhZVGKr1vispa5XHU33ZGKzQW0vOiDuR7z3aT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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