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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aeaa2f99d6628d5c0a29aea3629e7b07cd4d62d9b439859d5c53c12aff56cfb' 
  AND token = 'Llf/Cy4zfEfdAX2OvXEx/ZQtlXrIz2KXzw9qihHsjUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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