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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9177242fc87f76b93aedba5783f4b71f939811fe4c5211e2a1cf642359d7e75e' 
  AND token = 'ooy1Lwzh5tryROn7fOgRu/2VogwfL7h0lELhVnjMeMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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