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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d27a77cb6de8b3ea8a8bcd9f121ef7aea0410906295c47490f7a0b833185de' 
  AND token = 'zxOiqYQqgh6QkdJVTLyNw3z2mKo6v5wckJ1Xc89S9SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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