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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade712302be55a86bdd8a9063ff95e741f104a6fb70e13ca14eb705cc259101b' 
  AND token = 'jXSbbkT1AkQmiOLzC1NDYowgELpRbag7Y7A75w9Yu2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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