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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1e58252fa5eb0a3ecf58b32e84328690825c4b7d5f1fe29aa8df02cbb1ebad' 
  AND token = 'ZKq+el4OpyXyFl25Se/XXO+12zljet5pUgbtRKul6io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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