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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e992adbc545c95fea817ebf5c98b1e325c8365803c77e3312f91ba0c165f98cb' 
  AND token = 'Ic5sCP84FIm9vZjf1I8W/GIwbB+T0m4ewjjIic9Mn1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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