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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f44df218213fee0acc387218290841b6e232df1357e7964f6a5dd9646f155e' 
  AND token = '+aJHLg6oenBygOevP2v2G4RoZcu0TGlrAJeI5y6R9HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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