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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e262bafd2c9f5b42914a334976bd7105c12ea1de6f2299acbd30790b10e526ef' 
  AND token = 'p+HH14loUaOSYKuOc6IFwG5Yugk/9JaunZqgE66P15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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