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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976c1e21ddb2e804431c5d9d1925f418ec51367422fb1c8a48a643afdd27ae30' 
  AND token = 'KkMlrZFgyPzDkL8vubZTQL3Ae7ymkmvNQrTWQKfZXzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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