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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991269806de3a02679ac3ee25404315b1f6dbdc259dab80c5fe47937b022c463' 
  AND token = '2Njd7sV0soDOYssJbc4OTWtKMkeAlsWDyO84PfM6aNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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