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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff2efd6bc3aec27fd969b5c74fd149f06a361a873d3c9ebdd7eb78966eeb643' 
  AND token = 'PN0claebAdnndPgM2jtvFBjDQ6oyZ0iZF9hrrAooEcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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