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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc417015aa6b471951fd9c188bfba989499ab1e51219d4fee5d79fe2945e8f1e' 
  AND token = '70WGNdqg5IdTIAF7gU03Sg5kEg/9GHVbFNwW3ugGXiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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