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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a12affb450c1ddf0e0751fe01cc9e14e721aa30e2a90a69203b99c0257ac1c' 
  AND token = 'tRQQ/jphC4L3yWLFQH68h7O3VyevzNKpYD7daRdk9PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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