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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744ba052c98da931cd193aaf040deb3345493d1e79c87c068e2cf9dc25cc5dfd' 
  AND token = 'vYZdJV1cHzhMhg85J7mFm/jd19sOhv6IZrK24soPP1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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