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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba1920eb3e5d0f0bd3aad749b725223e4f241764c567a3e433d611428ca6b03' 
  AND token = '4rfHJ3Qlfax1SPaChwFkSi79kFdEzPnGC58kfbu0+QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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