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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf62d98eeee219158bfdae00ec48b569c0fce0d789e38f8f9af7f23c6893018' 
  AND token = 'FZf5ugL1iQZ1gs9XfxJfFvKHhLHxTLRyMHVqey3a9X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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