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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6b42774b034266915abe3a06f20f8f037f17df139df1caa30e81b379539e75' 
  AND token = 'c86fznTEkekmKr438KnAOU/aHDWTF1RKiFzt2KfaaOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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