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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fce7d4549c00380a7f41d1b5c1832e73bb9c8dd0ca45493590e7bd927f5abd6' 
  AND token = '/XJf6u/2rnJz7kSiTqyUPt64qxxLd0fiPuJv3ww80Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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