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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12b84f89b4784b59c169c9a1a432892f1122b4f483715a5aaa998715492928a' 
  AND token = '4SaM4sFSbwDqsnO79s/Y7emzIOOvgib7CXW+MxpsqlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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