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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd957acef3efa634161a601de40b9a2e10e6239ee02f21e2d2e6f99f7f1b1cafa' 
  AND token = 'UE9atxlaYaCPS/5JkdAwQlkfml6Qi5LMKCdMKYMIcdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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